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Effect of Fumigants on the Soil Status and Plant Uptake of Certain Elements¹

ABSTRACT

Fumigants commonly used or studied in relation to pineapple production in Hawaii are D-D, EBD, BBC (1,2-dibromo-3-chloropropane), and methyl bromide. These fumigants sometimes increase and sometimes decrease the quantity of iron that may be extracted from the soil. Use of D-D and methyl bromide appears to improve the utilization of iron within the plant but not the uptake of iron by the plant. Fumigants sometimes lower the oxidation-reduction potential in otherwise unamended soil. When combined with easily decomposable organic matter, they very markedly reduce this potential. The effect of fumigants in increasing availability of maganese in the soil and to the plant may be large, and may persist for many months. Fumigants frequently increase the phosphorus content of soil extracts, and D-D has increased the phosphorus "A value" in greenhouse tests, but use of D-D or methyl bromide in the field consistently results in reduced phosphorus uptake by the plant.

¹ Published with the approval of the Director as Technical Paper No. 292 of the Pineapple Research Institute of Hawaii, Honolulu. Presented before Div. III, Soil Science Society of America, Aug. 22, 1962, at Ithaca, N. Y.

² Soil Chemist.

Received for publication August 28, 1962. Accepted for publication March 15, 1963.